| Grant number: | 23/04859-8 |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| Start date: | July 01, 2024 |
| End date: | June 30, 2026 |
| Field of knowledge: | Engineering - Nuclear Engineering |
| Principal Investigator: | Linda Viola Ehlin Caldas |
| Grantee: | Anderson Manoel Bezerra da Silva |
| Host Institution: | Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil |
| Associated research grant: | 18/05982-0 - R&D&I in radiation metrology in the health area, AP.TEM |
Abstract Different synthetic and inorganic materials with luminescent properties, including those based on CaSO4, have been used for ionizing radiation dosimetry by thermoluminescence (TL) and optically stimulated luminescence (OSL) techniques. Studies of CaSO4-based materials show that, despite their high TL sensitivity, CaSO4:Mn presents dosimetric limitations because it has very shallow energy levels from the trapping centers charge carriers responsible for the luminescent signal. However, recently it was observed that this compound presents promising characteristics for OSL dosimetry. In an attempt to overcome this limitation, the incorporation of new elements as co-dopants of CaSO4 has also been proposed. Unusual rare-earth elements such as terbium (Tb) present characteristics that makes doped CaSO4 promising to be applied as a TL/OSL dosimeter. Thus, this work proposes the production and the structural, optical and dosimetric characterization of CaSO4 composites doped with manganese and terbium with different dopant concentrations, with the purpose of using them as TL/OSL dosimeters as alternatives to those commercially available. The crystals will be produced by conventional methods such as slow evaporation, sol-gel, precipitation, and solid-state reaction. The dosimetric characteristics of CaSO4:Mn,Tb such as sensitivity, linearity, reproducibility, minimum detectable dose, fading and the kinetic parameters of the TL emission and OSL decay curves will be evaluated, in a comparative way with commercially utilized dosimeters. Additionally, atomistic calculations of the materials will be conducted using the computational code GULP to understand the location of dopant ions within the crystal lattice, the mechanisms of charge compensation, and the influence of intrinsic and extrinsic point defects on the optical properties of this material. | |
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